When does a chip become a French fry?

No one ever asks for fish and French fries. But you never get a big mac and chips at macDonald's. To complicate things you get burger and chips as a pub. French fries are skinnier and crisper, but some chips are crispy too. And I definitely know when I've ordered chips off a menu they've fobbed me off with French fries

So where is the line crossed? Where does a French fry become a chip? When you look at a plate how do you decide what to call them
When does a chip become a French fry?
When does a chip become a French fry?
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